HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>timeStamp vs Date.getTime</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }

    button { padding: 8px 16px; }

    #log { margin-top: 12px; padding: 12px; background: #f1f5f9; border-radius: 6px; font-size: 13px; line-height: 1.6; }

  </style>

</head>

<body>

  <button type="button" id="btn">Click me</button>

  <div id="log">Click the button.</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#btn").on("click", function (event) {

      var now = (new Date()).getTime();

      var lag = now - event.timeStamp;

      $("#log").html(

        "event.timeStamp: " + event.timeStamp + "<br>" +

        "Date.getTime(): " + now + "<br>" +

        "handler lag: " + lag + " ms"

      );

    });

  </script>

</body>

</html>

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jQuery event.timeStamp vs Date.getTime() (Try It)